I don't understand the U.S.-English habit of title case...

It is common in English-language publications to capitalize words in the title (the full detail on rules behind “title case” in this Wikipedia entry). Once (in the early days of printing), it might have been a good way to emphasize words. In today’s PowerPoint presentations I find that title case actually makes it harder to read the title of a slide.

I do not use it.

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